package com.hivekion.common.IP;

import com.alibaba.druid.util.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.servlet.http.HttpServletRequest;

public class IPUtils {
      private static Logger logger = LoggerFactory.getLogger(IPUtils.class);

      /**
       * 获取IP地址
       * <p>
       * <p>
       * <p>
       * <p>使用Nginx等反向代理软件， 则不能通过request.getRemoteAddr()获取IP地址
       * 如果使用了多级反向代理的话，X-Forwarded-For的值并不止一个，而是一串IP地址，X-Forwarded-For中第一个非unknown的有效IP字符串，则为真实IP地址
       */
      public static String getIpAddr(HttpServletRequest request) {
	    String ip = null;
	    try {
		  ip = request.getHeader("x-forwarded-for");
		  if (StringUtils.isEmpty(ip) || "unknown".equalsIgnoreCase(ip)) {
			ip = request.getHeader("Proxy-Client-IP");
		  }
		  if (StringUtils.isEmpty(ip) || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
			ip = request.getHeader("WL-Proxy-Client-IP");
		  }
		  if (StringUtils.isEmpty(ip) || "unknown".equalsIgnoreCase(ip)) {
			ip = request.getHeader("HTTP_CLIENT_IP");
		  }
		  if (StringUtils.isEmpty(ip) || "unknown".equalsIgnoreCase(ip)) {
			ip = request.getHeader("HTTP_X_FORWARDED_FOR");
		  }
		  if (StringUtils.isEmpty(ip) || "unknown".equalsIgnoreCase(ip)) {
			ip = request.getRemoteAddr();
		  }
	    } catch (Exception e) {
		  logger.error("IPUtils ERROR ", e);
	    }

	    //        //使用代理，则获取第一个IP地址
	    //        if(StringUtils.isEmpty(ip) && ip.length() > 15) {
	    //			if(ip.indexOf(",") > 0) {
	    //				ip = ip.substring(0, ip.indexOf(","));
	    //			}
	    //		}

	    return ip;
      }
}
